理解紧凑物体的形成和自然踢：II。XTE J1118 +480的案例
Understanding Compact Object Formation and Natal Kicks: II. The case of XTE J1118+480
摘要：
近年来，越来越多的自行银河系X射线双星已被测量。当辅之以精确的成分质量、轨道周期和施主有效温度的测定时，这些运动学约束包含了关于系统过去演化的丰富信息。在这里，我们考虑所有这些可用的信息来重建完整的演化历史的黑洞X射线双星XTE J1118+480，假设该系统起源于银河系盘和捐助者有太阳的金属丰度。这一分析占四个演化阶段：质量转移通过正在进行的X射线阶段，潮汐演化开始前的罗奇叶溢出，通过银河系的潜力后，形成的黑洞的运动，和二进制轨道动力学由于爆炸性的质量损失，并可能在核心崩溃时的黑洞出生踢。我们发现，在黑洞形成之后，该系统由一个质量约为6.0-10.0太阳质量的黑洞和一个质量约为1.0-1.6太阳质量的主序星组成。我们还发现，一个不对称的出生踢不仅是合理的，但需要为该系统的形成，并推导出的黑洞出生踢速度大小的下限和上限分别为80公里/秒和310公里/秒。
英文摘要：
In recent years, an increasing number of proper motions have been measured for Galactic X-ray binaries. When supplemented with accurate determinations of the component masses, orbital period, and donor effective temperature, these kinematical constraints harbor a wealth of information on the system's past evolution. Here, we consider all this available information to reconstruct the full evolutionary history of the black hole X-ray binary XTE J1118+480, assuming that the system originated in the Galactic disk and the donor has solar metallicity. This analysis accounts for four evolutionary phases: mass transfer through the ongoing X-ray phase, tidal evolution before the onset of Roche-lobe overflow, motion through the Galactic potential after the formation of the black hole, and binary orbital dynamics due to explosive mass loss and possibly a black hole natal kick at the time of core collapse. We find that right after black hole formation, the system consists of a ~6.0-10.0 solar masses black hole and a ~1.0-1.6 solar masses main-sequence star. We also find that that an asymmetric natal kick is not only plausible but required for the formation of this system, and derive a lower and upper limit on the black hole natal kick velocity magnitude of 80 km/s and 310 km/s, respectively.
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